In telecommunications (data rates) 1,000,000 bits in a megabit, apparently.
In computing (file size) 1,048,576 bytes in a megabyte, apparently (1,048,576 bits in a megabit)
There are different names available to distinguish them (e.g. kibibit/kilobit) but apparently, these and similar are often not used. Result? Confusion. http://en.wikipedia.org/wiki/Megabyte
I suspect that quite a few people don't realise this - I didn't. Makes a difference when you are trying to check your upload and download speeds and verify BT's claims about their speeds. 😉
There's something horribly wrong there.
131 072 bytes is 128K bytes, and nowhere near a megabyte. However, 131 072 bytes is 1 048 576 bits, or 1 megabit.
Moment of madness: corrected.
The point remains, that you have to adjust for this when testing internet speeds by timing file uploads or downloads and perhaps also before criticising BT for publishing 'exaggerated' speeds. Something that I discovered this evening!
The way I do it is X the results on speedtesters that give results in kbps [something like 74500/15500] by 1024.
The fake results above would be 74500x1024 = 76288000Kbps which = 76.28Mbps [approx 76.3Mbps] which is very near the line max after overheads.cool.:)
74954kbps = 76752896Kbps = 76.7Mbps
15207 = 15571968Kbps = 15.6Mbps
these are my actual readings.